What format does it record in?
My contourHD records .mov's and i just use quicktime to trim the videos. If a vehicle is involved then i save them as [Numberplate] [Date]. Otherwise it's [short description] [date]. if vehicles are involved, i was trim it from where i first saw it to where i last saw it.
I then keep 2 months worth of backdated footage which i delete every other week.
I also have a spredsheet which i use to record details of every i have reported to the police. So numberplates, reference, time, date, location etc..